size_t integrate_adaptive(
Stepper stepper , System system , State &start_state ,
Time &start_time , Time end_time , Time &dt ,
Observer observer , controlled_stepper_tag
)
{
typename odeint::unwrap_reference< Observer >::type &obs = observer;
typename odeint::unwrap_reference< Stepper >::type &st = stepper;
failed_step_checker fail_checker; // to throw a runtime_error if step size adjustment fails
size_t count = 0;
while( less_with_sign( start_time , end_time , dt ) )
{
obs( start_state , start_time );
if( less_with_sign( end_time , static_cast<Time>(start_time + dt) , dt ) )
{
dt = end_time - start_time;
}
controlled_step_result res;
do
{
res = st.try_step( system , start_state , start_time , dt );
fail_checker(); // check number of failed steps
}
while( res == fail );
fail_checker.reset(); // if we reach here, the step was successful -> reset fail checker
++count;
}
obs( start_state , start_time );
return count;
}
std::pair< time_type , time_type > do_step( System system )
{
failed_step_checker fail_checker; // to throw a runtime_error if step size adjustment fails
controlled_step_result res = fail;
m_t_old = m_t;
do
{
res = m_stepper.try_step( system , get_current_state() , m_t , get_old_state() , m_dt );
fail_checker(); // check for overflow of failed steps
}
while( res == fail );
m_stepper.stepper().prepare_dense_output();
this->toggle_current_state();
return std::make_pair( m_t_old , m_t );
}
size_t integrate_times(
Stepper stepper , System system , State &start_state ,
TimeIterator start_time , TimeIterator end_time , Time dt ,
Observer observer , controlled_stepper_tag
)
{
typename odeint::unwrap_reference< Observer >::type &obs = observer;
typename odeint::unwrap_reference< Stepper >::type &st = stepper;
typedef typename unit_value_type<Time>::type time_type;
failed_step_checker fail_checker; // to throw a runtime_error if step size adjustment fails
size_t steps = 0;
while( true )
{
Time current_time = *start_time++;
obs( start_state , current_time );
if( start_time == end_time )
break;
while( less_with_sign( current_time , static_cast<time_type>(*start_time) , dt ) )
{
// adjust stepsize to end up exactly at the observation point
Time current_dt = min_abs( dt , *start_time - current_time );
if( st.try_step( system , start_state , current_time , current_dt ) == success )
{
++steps;
// successful step -> reset the fail counter, see #173
fail_checker.reset();
// continue with the original step size if dt was reduced due to observation
dt = max_abs( dt , current_dt );
}
else
{
fail_checker(); // check for possible overflow of failed steps in step size adjustment
dt = current_dt;
}
}
}
return steps;
}
